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The part of the shear force diagram for a beam is shown in the figure If the bending moment at B is -9 kNm, then the bending moment at C is

The part of the shear force diagram for a beam is shown in the figure If the bending moment at B is -9 kNm, then the bending moment at C is Correct Answer 40 kN m

Calculation:

As the SFD (shear force diagram) is a triangle, therefore the beam will be loaded with uniformly distributed load (UDL).

Also, there is a sudden increase in shear force from -6 kN to 14 kN. Therefore, there must be a point load at point B i.e. equal to 20 kN.

Required beam is:

Given:

Bending moment at point B = -9 kNm

-w × 3 × 1.5 = -9

w = 2 kN/m

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Now,

Bending moment at C:

Mc = 20 × 7 - 2 × 10 × 5

∴ Mc = 40 kNm

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